红河油田地层可钻性研究与钻头优选

Research on the Formation Drillability and Bit Selection in Honghe Oilfield

摘要:

红河油田水平井钻头适应性差、起下钻频繁，导致机械钻速低和钻井周期长，严重制约了钻井提速提效。通过对红河油田地层岩心进行室内可钻性实验，建立了该地区岩石可钻性与声波测井相关性数学模型，从而确定了岩石可钻性级值剖面。实验及计算结果表明，红河油田地层可钻性级别为3～6级，上部属于软地层，下部属于中硬地层。基于地层可钻性优选了PDC钻头，经现场试验与应用，平均单只钻头进尺、机械钻速大幅提高，大大缩短了钻井周期，达到了水平井钻井提速提效的目的。

Abstract:

Caused by the poor bit adaptability and frequent tripping, low ROP and long drilling cycle of the horizontal well drilling in Honghe oilfield severely restricted the drilling speed and efficiency. A correlation mathematical model of rock drillability and acoustic logging is established based on laboratory drillability experiments on the cores of Honghe oilfield, and the rock drillability grade profile is determined. The experiments and calculated results show that the drillability grade in the Honghe oilfield formation ranges from grade 3～6, the upper part belongs to soft formation and the lower part medium-hard formations. PDC bit is selected based on formation drillability, the average single bit footage and ROP are largely improved and the drilling cycle is shortened in the field tests and application, horizontal well drilling speed and efficiency improvement have been achieved.